1 /* $NetBSD: cpu_fdt.c,v 1.8 2018/07/02 16:36:49 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: cpu_fdt.c,v 1.8 2018/07/02 16:36:49 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/device.h> 35 #include <sys/lwp.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 39 #include <dev/fdt/fdtvar.h> 40 41 #include <arm/armreg.h> 42 #include <arm/cpu.h> 43 #include <arm/cpufunc.h> 44 45 static int cpu_fdt_match(device_t, cfdata_t, void *); 46 static void cpu_fdt_attach(device_t, device_t, void *); 47 48 enum cpu_fdt_type { 49 ARM_CPU_UP = 1, 50 ARM_CPU_ARMV7, 51 ARM_CPU_ARMV8, 52 }; 53 54 struct cpu_fdt_softc { 55 device_t sc_dev; 56 int sc_phandle; 57 }; 58 59 static const struct of_compat_data compat_data[] = { 60 { "arm,arm1176jzf-s", ARM_CPU_UP }, 61 62 { "arm,arm-v7", ARM_CPU_ARMV7 }, 63 { "arm,cortex-a5", ARM_CPU_ARMV7 }, 64 { "arm,cortex-a7", ARM_CPU_ARMV7 }, 65 { "arm,cortex-a8", ARM_CPU_ARMV7 }, 66 { "arm,cortex-a9", ARM_CPU_ARMV7 }, 67 { "arm,cortex-a12", ARM_CPU_ARMV7 }, 68 { "arm,cortex-a15", ARM_CPU_ARMV7 }, 69 { "arm,cortex-a17", ARM_CPU_ARMV7 }, 70 71 { "arm,arm-v8", ARM_CPU_ARMV8 }, 72 { "arm,cortex-a53", ARM_CPU_ARMV8 }, 73 { "arm,cortex-a57", ARM_CPU_ARMV8 }, 74 { "arm,cortex-a72", ARM_CPU_ARMV8 }, 75 { "arm,cortex-a73", ARM_CPU_ARMV8 }, 76 77 { NULL } 78 }; 79 80 CFATTACH_DECL_NEW(cpu_fdt, sizeof(struct cpu_fdt_softc), 81 cpu_fdt_match, cpu_fdt_attach, NULL, NULL); 82 83 static int 84 cpu_fdt_match(device_t parent, cfdata_t cf, void *aux) 85 { 86 struct fdt_attach_args * const faa = aux; 87 const int phandle = faa->faa_phandle; 88 enum cpu_fdt_type type; 89 int is_compatible; 90 bus_addr_t mpidr; 91 92 is_compatible = of_match_compat_data(phandle, compat_data); 93 if (!is_compatible) 94 return 0; 95 96 type = of_search_compatible(phandle, compat_data)->data; 97 switch (type) { 98 case ARM_CPU_ARMV7: 99 case ARM_CPU_ARMV8: 100 /* XXX NetBSD requires all CPUs to be in the same cluster */ 101 if (fdtbus_get_reg(phandle, 0, &mpidr, NULL) != 0) 102 return 0; 103 104 const u_int bp_clid = cpu_clusterid(); 105 const u_int clid = __SHIFTOUT(mpidr, MPIDR_AFF1); 106 107 if (bp_clid != clid) 108 return 0; 109 break; 110 default: 111 break; 112 } 113 114 return is_compatible; 115 } 116 117 static void 118 cpu_fdt_attach(device_t parent, device_t self, void *aux) 119 { 120 struct cpu_fdt_softc * const sc = device_private(self); 121 struct fdt_attach_args * const faa = aux; 122 const int phandle = faa->faa_phandle; 123 enum cpu_fdt_type type; 124 bus_addr_t mpidr; 125 cpuid_t cpuid; 126 127 sc->sc_dev = self; 128 sc->sc_phandle = phandle; 129 130 type = of_search_compatible(phandle, compat_data)->data; 131 132 switch (type) { 133 case ARM_CPU_ARMV7: 134 case ARM_CPU_ARMV8: 135 if (fdtbus_get_reg(phandle, 0, &mpidr, NULL) != 0) { 136 aprint_error(": missing 'reg' property\n"); 137 return; 138 } 139 140 cpuid = __SHIFTOUT(mpidr, MPIDR_AFF0); 141 break; 142 default: 143 cpuid = 0; 144 break; 145 } 146 147 /* Attach the CPU */ 148 cpu_attach(self, cpuid); 149 150 /* Attach CPU frequency scaling provider */ 151 config_found(self, faa, NULL); 152 } 153